came across http://freetts.sourceforge.net/
the first demo of cocoon that I ever did in public was a hello world page in html, pdf, svg and voicexml, with the little merlin dude speaking 'hello world' to the audience (got a standing ovation for that!) It always bugged me that I needed an external tool for that that worked only on windows... but I found this.
Have no time, but it would be cool if somebody could write a voicexml->wav serializer using that (it's BSD).
-- Stefano.
